Re: Generic template question

Thursday, February 19, 2009, 9:56:49 PM, Kirill wrote:
> Hi Daniel,
>
> Thanks for your input. I tried that and got no luck...
>
> So, given the sample XML:
> <root>
> <item attr1="123" attr2="345">itemText</item>
> </root>
>
> and taking into consideration scenario, that we don't know for sure
> how many <item>'s are there, and attributes in each item as well -
> what the template has to look like?
>
> This is what I got so far:
>
> <#ftl>
>
> <#recurse doc>
>
> <#macro @element>
>     <#if .node?children?has_content>
>     ${.node.@@start_tag}
>     </#if>
>
>     <#if !.node?children?has_content>

(That could be done better with <#else>.)

>     <${.node?node_name}/>
>     </#if>


>     <#if .node?children?size = 1>
>         ${r"${"}${.node?parent?node_name}.${.node?node_name}${r"}"}
>     </#if>
>
>     <#if .node?children?size &gt; 0>
>     <#recurse>
>     </#if>
>
>     <#if .node?children?has_content>
>     ${.node.@@end_tag}
>     </#if>
> </#macro>
>
> Can I just specify a macro for all attributes?
> Something like:
> <#macro @attrName>
> <#list @element["@*"] as attributes>
> ${attributes?node_name}
> </#list>
> </#macro>

Yes, you can. The key problem is problem is, #recurse doesn't attempt
to visit attribute nodes (because W3C DOM doesn't treat attributes as
children). But you can solve that like this:

  <#macro recurseAttributes>
    <#list .node["@*"] as att>
      <#visit att>
    </#list>
  </#macro>

And then, you can do something like:

  <#macro @element>
    ELEM: I'm the ${.node?node_name} element.
          I'm belonging the ${.node?node_namespace} namespace.
    <@recurseAttributes/>  <#-- Visit attributes only -->
    <#recurse>             <#-- Visit all other kind of nodes -->
  </#macro>

  <#macro @attribute>
    ATT: I'm the ${.node?node_name} attribute
         of an ${.node?parent?node_name} element.
         I'm belonging to the ${.node?node_namespace!'void'} namespace.
         My value is: ${.node}
  </#macro>

> (Also, that <#if> test you mentioned redundant has to be there,
> otherwise there is no recursion to child nodes, for some reason...).

No way. That #if will always execute #recurse, except if there is no
child node, and in that case it won't do anything, no mater if the #if
is there.

> Thanks again,
> Kirill
>
>
> On Thu, Feb 19, 2009 at 2:29 AM, fm <[email protected]> wrote:
> Hello Kirill,
>
> Thursday, February 19, 2009, 5:14:32 AM, you wrote:
>
> [snip]
>> <#macro @element>
>>         ${.node.@@start_tag}
>>         <#if .node?children?size = 1>
>>                 ${r"${"}${.node.@@qname}${r"}"}
>>         </#if>
>>         <#if .node?children?size &gt; 0>
>>                 <#recurse>
>>         </#if>
> [snip]
>
> (I suppose #recurse just does nothing if there are no children, so
> that #if is redundant there.)
>
> [snip]
>> The question is - how do I get to the bound namespaces and attributes?
>
> whateverNode?node_namespace
>
>> For example, if I get a tag like: <root attribute="value"/>, how do I
>> get to "attribute" and its' "value"?
>
> If you know the attribute name, you write someElement.@someAttName.
> If you don't know the attribute names you can list them with
> someElement["@*"] (or someElement.@@ -- same thing, just not
> immediately obvious for those who know XPath). Then if you have the
> attribute name in variable, you can write someElement["@" + attName].
>
>> Or, if I get a tag like <root xmlns:namespace="HTTP://foo"/>, how do I
>> retrieve the "xmlns:namespace" part (and its' value)?
>
> You don't usually. Unfortunately (as far as I know...) the XML infoset
> W3C rec. doesn't state that xmlns attributes are not part of the
> infoset, but for practical purposes they are irrelevant when
> processing XML. You can query the namespace of the node belongs to
> with ?node_namespace, for *each* node, regardless of the location of
> the xmlns attributes.
>
>> Thanks for all the input.
>
>> - Kirill
>
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>
>
>
> --
> Best regards,
>  fm                            mailto:[email protected]
>
>
>

-- 
Best regards,
 Daniel Dekany


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-OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise
-Strategies to boost innovation and cut costs with open source participation
-Receive a $600 discount off the registration fee with the source code: SFAD
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